Fixes missing return values in Submodel Service Repository Http compo…

[geso02]

See issue: #614

[aaronzi]

Hi @geso02,

Thank you for your PR.
Please have a look at the remarks on this PR: #484
The fix involves a few more steps/changes.

Since the other PR is almost ready, I would suggest you have a look at it and see if that PR already fixes the problem you are trying to fix in yours. If yes I can try to finalize the PR so that the fix is deployed as fast as possible.

[geso02]

My implementation returns the passed element without using a result from the repository service. I think this is sufficient, as the data storage does not change the object. This would be useful if, for example, an ID is generated from an SQL database via a sequence. We do not have this case in our implementation and so the solution here would be the simplest. But you can also use the other solution, as we are using the locally built image with the bug fix for now.

[aaronzi]

Superseded by #484